References
- Crampton , Ward C. 1908 . Physiological age—a fundamental principle . American Physical Education Review , : 141 – 154 . 214 – 227 . 268 – 283 . 345 – 358 .
- Dimock , Hedley S. 1937 . Rediscovering the Adolescent , New York : Association Press .
- Keithly , Rowlen B. 1939 . Relationship between physiological age and motor and physical development , State University of Iowa . Unpublished master's thesis
- McCloy , C. H. 1946 . Tests and Measurements in Health and Physical Education. , 2nd ed. , New York : F. S. Crofts and Company .
- McCloy , C. H. 1932 . The Measurement of Athletic Power , New York : A. S, Barnes and Company .
- 1945 . The Iowa Program of Physical Education for Boys in Secondary Schools. , Tentative edition. , Pes Moines , Iowa : State Department of Public Instruction .